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醚,官品也,醚官能團為徵,乃氧原子接烷基、芳基於兩端者也,通式R–O–R'。醇酚羥基之氫者,代之以烴基,亦為醚也。醚者,蓋分對稱、不稱兩類。氧之左右烷基同者,為對稱醚,乙醚者(CH3–CH2–O–CH2–CH3)為之;異者,不稱,甲乙醚(CH3–O–CH2–CH3)為之。
乙醚者,常用之醚也,為有機溶劑、醫用醉藥,多以醚直呼之。醚類合質,有機、生物化學多用之,亦可為糖類、木質素之接段也。
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